Chair arm



FIG. 1 is a perspective view of a chair arm;

FIG. 2 is a front elevational view of the chair arm;

FIG. 3 is a first side elevational view of the chair arm;

FIG. 4 is a rear side elevational view of the chair arm;

FIG. 5 is a second side elevational view of the chair arm;

FIG. 6 is a top plan view of the chair arm; and,

FIG. 7 is a bottom plan view of the chair arm.

The broken lines in the drawings form no part of the claimed design. 

CLAIM The ornamental design for a chair arm, as shown and described. 